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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-16496

# Freitas, A; Haisch, U (2008). B̅ →Xsγ in two universal extra dimensions. Physical Review D, 77(9):093008.

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## Abstract

We calculate the leading order corrections to the [overline B]-->Xsgamma decay in the standard model with two large flat universal extra dimensions. We find that the contributions involving the exchange of Kaluza-Klein modes of the physical scalar field a(kl)[plus-minus] depend logarithmically on the ultraviolet cutoff scale Lambda. We emphasize that all flavor-changing neutral current transitions suffer from this problem. Although the ultraviolet sensitivity weakens the lower bound on the inverse compactification radius 1/R that follows from [overline B]-->Xsgamma, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cutoff and higher-order effects, we find 1/R>650 GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R<~600 GeV preferred by dark matter constraints.

## Citations

27 citations in Web of Science®
28 citations in Scopus®